Power-operated handsaw



F. BJORKLUND POWER OPERATED HANDSAW April 26, 1-927.

Filed Oct. 2. 1925 3 Sheets-Sheet 1 I ATTORNEY WITNESS:

April 26, 1927.

F. BJORKLUND POWER OPERATED HANDSA-W Filed Oct. 2, 1925 3 Sheets-Sheet 2 Feb? 470% lam INVENTOR ATTORNEY WITNESS:

o 7 F. BJORKLUND POWER OPERATED HAiwsAw Filed 001'.- 2. 1925 5 Sheets-Sheet 3 m W W Patented Apr. 26, 1927,

"snug; nJonKLUNn, or FAIRPOR-T Hermon, c1110.;

POWER OPERATED HANDSAW.

' A h tmfim ers 1 2 1 ee 6 1 0 21 h ly invention also providesa saw or'other o l. which an b onvenien y Ca ed fi r i place to place and connected with'an electrical supply to operate ;a mechanism which in turn reciprocates the saw or other tool.

l/Vith the preceding and other objects and advantages in mindfthe invention consists t in the nov ombi atie i l mi e' r Figures 9 to 12.

struction and arrangementofparts and 6p- @lfetions to be hereinafterinore specifically referred to, claimed and illustrated inthe c mp nyi drawin s wherein ig r 1 is an e vat n ofe SW 9 11- structed in accordance with my inventionl Figure 2 is a vertical: sectional view'of h saw p oper: v i g Fig. 2 is a vertical sectional view taken through the casing which houses the'oPerat-i g c is f r the esew- Fi 31 atransverse sectional view of the saw proper. g

Figure 1 is a horizontal-sectional View taken on line kept-Figure 1. t

Figure 5 is, a detail elevationof a modified form of the invention. f Figure 6 is a side elevation of the same. Figure 7 is asectional view of the form of ithe invention shown in Figures 5 and 6.

Figure 8 is a vertical sectional view therethrough.

Figure 9 is a longitudinal sectional View through another modified form.

Figure 10 is a fragmentary perspective View of the cable for the form shown in Figure 11 is a sectional View taken on the line 1111 of Figure 9.

Figure 12 is a detail View of the log hold ing means for the modified form as shown in Figures 9 to 12. Referring to the drawings in detail wherein corresponding characters of reference denote corresponding parts throughout the several views,; and particularly to Figures 1 to i inclusive, the numeral" 5 designates a I abul r saw" arbe fa ewhisih -$"f n\ .d wi l en met l ext sions! 6"eiids at i ends, and v'vhic'h are open at'their bottoms rind/i sisted h, p n 8 p n i inner e d Me a l b s a d for c s b7 pp: the arbor 5 and 1n the extensions 6 and 7 1s a sawbl'ade9, the latter passingftlirough the enemies 8 as share- A rang d. 1 ltlies'Xl te s ns 6i d 7 and @1 9? is a p u ality pa ing a ound he-enemas P11 h u ing 7 andfattachedto the forward end e i of thesaw blade as shown at 12; second flexible elen ent13 'is attached directly to the oppositeend of the blade l Both-flexible elements 11 and 13 extend through a flexible,

u s w h s att h d teen wear emes he eei se s e ifica ly sk er-red The numeral 15 designates a rectangular casing having an opening 16 in its cheaty nt e l emen with a i e ii l which upl s the x ble ube 1 1% his 1 fr W l A ranks t 18 s lqll ld in bes es .9With th casing 53 a 'dine ii e so i a p Qfe esl te y 'eX end g't ows201; i,

An electric 1notor21 is 'mounted within'the s n 1.5 d is e at y l neat n plug '22 With a suitablelelectric fixture of a source 'o fel-ectric energy. "A drive shaft is also arranged n' the casing 15 bet-ween the motorf21 and the crankshaft l8 and is was e 's-12111 95 2 th iattef b n V d en by a be t2 messe w th the e i a le "l eu of e m ter-v T ie hift i e crank shaft 18 are each provided with sprocket wheels 26 which are operatively connected together by a sprocket chain 27;

The flexible elements 13 and" 11V pass through the openings 16 and between a pair of vertically arranged spaced guide pins 28 y and are connected to collars 3O fixed tothe 13 to relieve the saw bladeofsudden jerks or strain incident to the operation of the same.

' throws 2O vof the crank shaft 18'. A 0011 tractile spring 31 is interposed in the cable -In'tl1e modification shown in Figuresfi to 8 inclusive, I provide a channel-shaped casting 32 having a rearwardly extendingtubular extension 33 and a hand grip 34; cast integral therewith. A reciprocable saw blade is designated at 35 and attached thereto is a shank 36 slidably ,mounted in the tube 33. An anti-friction roller 37 is journaled at theupper end of the casting 32 and contacts with the upper edge of, the saw blade 35.

Arranged upon: opposite sides of the saw blade 35 and journaled on pins 38- in the side walls of the casting 32 are spacedrollers 39. In. this formot the invention each of ures 1 to 4, inclusive.

In F-igures9 to 12, inclusive, I have'illustratedianother modification of the invention,

and I have provided a means for controlling saw adjacent thesame, andin this last moditied form the casting is indicated by the reference numeral 42 which is somewhat similarto the cas1ngf32. However, 1t w1ll be noted that the casting 42 is formed with a bore 43 slightly enlarged as at44 to accommodate a s'lidable control element 45 which has. secured thereto a cable 46 adapted to be associated with a switch or other similar eleg ment (not shown) to control a driving motor. or. the like of similar structure as shown in FlgureA.

The saw 47 is operated in exactly the same manner as thesaw 35, but in'this instance there is secured to the casting 42 at a point adjacent its outer end asaw guide 48 which is pivoted as shown and formed with a chan n'el-shaped sawv engaging portion 49. There is also pivoted to the casting 42 as at 50 a log holding means 51 which istoothed as at 52 ,for'the purpose as shown in Figure 9.

' While I have showncand described the preferred embodiment of the invention, I

desire to have it understood that such changes may be made in the form, constructlon, arrangement of parts and operations as ne ates will not depart from the spirit of the invention or the scope of the subj oined claims. What is claimed is -1. A tool operating implement comprising.

a frame, guide .pulleys mounted for location therein, a saw reciprocable in said frame, a caslng, a rotatable crank shaft having 013- positely extending throws and being jour-' naled in the casing, flexible elements connected with the throws, a fiexibletube receiving said flexibl-e'elements therethrough and extendingfrom the casing to the frame, one of the 'fiexible elements being trained about the pulleys arranged in the ira-meand' connected to the/forward end of the tool,

and the other flexible element being directly connected to the opposite end of the tool. 2. A mechanism of the character described comprising a casing, a crankshaft journaled therein having oppositely extending throws,

a motor in thejcasing oper'at'ively connected with the crank shaft, a flexible tube leading irom the casing, a tool holder, a plurality of guide pulleys *journaled in the tool hold-.

er, a pair offiexible elements connected'to the throws and passing through he flexible tube, and one of said flexible elements being passed around the pulleys and connected to the forward end of-the'tool'and-the other being. directly connected to'the opposite end ofthetool; i i

3. An apparatus of the character described comprising a casing, acrank shaft journaled therein and having oppositely extending throws, a motor in the casing 'operativelyt connected with the crank shaft, a flexible 1 tube extending from the casing, a saw holder associated with the end of the flexible tube,

guide pulleys journaled in the saw holder,

apair of flexible elements connectedto the throws and passingthrough the flexible tube,

and said flexible elements being associated with the pulleys for reciprocating the sawthrough the instrumentality-of the throws,

controllingtheoperation of the saw. v I

and means carried by said saw holder for f In testimony'whereof-I afiix my signature.

FELIXWBJORKLUND." 

